How do I make a new page to add my php ad code?

Something like that is pretty complicated in osclass, best way is to create plugin and use routes, or use routes in theme.

Hello
I found something that does not need a plug-in. Create a normal page in the admin panel, then the page you need, in the theme folder and just works to add to the extension of the 'page-' page.
Example:
We have my-page.php inside the theme
The page created my-page in the admin panel
Then modify 'my-page.php' with 'page-my-page.php'
The key is 'page-'
And you'll be able to add header and footer later to page-my-page.php